67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
#ifndef _H_INSTANCEDRAW_H
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#define _H_INSTANCEDRAW_H
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#include <vector>
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#include <glm/glm.hpp>
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#include <thirdparty/glad/glad.h>
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#include <cstring>
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#define MAX_INSTANCES 1000
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#define MAX_TEXTURES 31
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class Texture;
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class TextureArray;
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struct InstanceData {
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glm::mat4 modelMatrix;
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glm::vec2 originalSize;
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int tileIndex = 0;
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int textureIndex = 0;
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int tilesPerRow = 0;
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int startID = 0;
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};
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class BaseInstanceDraw
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{
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public:
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virtual ~BaseInstanceDraw() {}
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virtual void setup() = 0;
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virtual void updateInstanceData(const std::vector<InstanceData>&) = 0;
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virtual void draw() = 0;
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protected:
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unsigned VAO, VBO, EBO, instanceVBO;
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Texture* texture = nullptr;
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InstanceData instanceData[MAX_INSTANCES];
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size_t numOfInstances = 0;
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unsigned indices[6] = {
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0, 1, 2,
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3, 2, 0
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};
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};
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class TileTextureInstance : public BaseInstanceDraw
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{
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public:
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TileTextureInstance(const char* texturePath);
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TileTextureInstance(const std::vector<const char*> texturePaths);
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void updateInstanceData(const std::vector<InstanceData>&) override;
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void draw() override;
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const TextureArray* getTextureArray() { return textures; }
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const Texture* getTexture() { return texture; }
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private:
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void setup() override;
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TextureArray* textures = nullptr;
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float vertices[20] = {
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// vertex
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-0.5f, -0.5f, 0.0f, 0.0f, 0.0f, // bottom left
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0.5f, -0.5f, 0.0f, 1.0f, 0.0f, // bottom right
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0.5f, 0.5f, 0.0f, 1.0f, 1.0f, // top right
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-0.5f, 0.5f, 0.0f, 0.0f, 1.0f // top left
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};
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};
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#endif // _H_INSTANCEDRAW_H
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